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When TPM/chaps is not fully initialized, the method returns -1 and Chrome should
attempt a retry later. The existing implementation overwrote the slot id always
by 0 and as a result disabled the retry, leading to a failure on establishing
the device ownership on certain cases.

BUG=b/37259691
TEST=`cros flash ssh://dut xbuddy://remote/samus/R61-9693.0.0/test;
 test_that --args="value='samus-release/R61-9694.0.0'" provision_AutoUpdate;
 test_that cheets_StartAndroid` > "Manage other people" setting is modifiable.

Change-Id: I9ebb731ba8004a61a9d868f3e586fe32d1979ab9
Reviewed-on: https://chromium-review.googlesource.com/558528Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487409}